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APK Notes:

* Brand new design - Authenticator has received a modern design refresh and an extra layer of polish, plus you can see great Blizzard franchise art every time you load up the digital code.
*Usability improvements – Getting a code now features an improved visual indicator, easy clipboard copy, and an animated count-down.

This release does not have a Play Store Description, so we grabbed one from version 2.2.2:

The app offers two factor authentication, protecting everything from your most storied World of Warcraft characters to your meticulously crafted Hearthstone decks. The authenticator app provides a one-touch button experience so you can approve or decline any login attempt. With the Mobile Authenticator, you can rest easy knowing that your Battle.net account is more secure.

Permissions: This app requires access to Photos/Media/Files so you can save a screenshot of the Serial Number and Restore Code. This makes it easier for you to restore the Battle.net Authenticator app when you get a new device or reinstall.

Note: This app is not compatible with classic Battle.net games (StarCraft, Diablo II, and Warcraft III).